Is following someone on social media shirk?

This is not shirk. There are different types of following. Like you follow the imaam in namaaz, nobody considers this to be shirk. A child follows and imitates his father; this is not considered as shirk. The wife obeys and follows the husband's command; this is not shirk. The Quraan Shareef has clearly instructed that we enquire and take the cue from those who are learned and righteous. Yusuf (alaihis salaam) had announced that I follow the ways of my father, Ebrahim, Ishaaq and Yaqub (alaihimus salaam). Shirk is to follow someone and obey him believing him to be god and having the rights of a deity.

And Allah Ta'ala (الله تعالى) knows best.